Drill-gage



(No Model.) f A W. A. GROPPER & J. A. LONIE. .DRILL GAGE.

No. 458,359. Patented Aug. 25, 1891.

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UNITED STATES PATENT OFFICE.

\VI LLIAM A. CHOPPER AND JOHN A. LONIE, OF BOSTON, MASSACHUSETTS.

DRILL-GAGE.

SPECIFICATION forming part of Letters Patent No. 458,359, dated August25, 1891.

Application filed January 27, 1891. Serial No. 379,254. (No model.)-

To all whom it may concern:

Be it kn own that we, WILLIAM A. CROPPER and JOHN A. LONIE, of Boston,in the county of Suffolk and State of Massachusetts, have invented a newand Improved Gage for Usein Grinding Drills, of which the following is aspecification.

In grinding (for sharpening purposes) drills such as are used indrilling metal it is extremel ydiiiicult to grind the two lips equally--z'. e., so that they are of equal length. As, it the lips are notalike, the hole made by the drill will be too large, owing to the factthat one lip cuts away more stockthan the other, It is important thatsome device should be employed to accurately gage the lips.

The accompanying drawing is a view or elevation showing a drill with ourgage applied thereto, a small portion of the latter being broken out.

A represents an ordinary drill, such as is used in operating on metal,and a a are the lips, which are ground from time to time as needed.

B is a long metallic rod bent back upon itself ait B, with its upper orhooked end pointed, as shown at 6.

LC is a sliding block perforated to receive the rod B, and held in anydesired position on esaid rod by the set-screw D.

E is an indicating gage or pointer integral with the slide C andextending therefrom at right angles with the rod B and pointed at itsouter end E.

To gage the lips a, the drill A is held in one hand and the pointed endI? dropped into the small depression which is alwaysfound in the upperend of a drill By adjusting the block 0 on the rod D the drill may beturned and the two lips to presented in turn to the point E of thepointer E and their accuracy tested.

Having thus fully described our invention, What we claim, and desire tosecure by Letters Patent, is

The herein-described gage for use in grinding drills, consistingof theintegral rod B, bent back upon itself at B and pointed at its upper endI) to engage in the depression in the upper end of the drill, and theslide C, provided with the pointer E, pointed at its outer end E forgaging the lips of the drill, said slide being adjustably secured to therod, sub stantially as set forth.

\VILLIAM A. OROPPER. JOHN A; LONIE.

\Vitnesses:

HENRY W. WILLIAMS, J. M. HARTNETT.

